Oh, for you.

Try one of the Dragon Quest remakes. They are kind of silly, but they are also down-to-Earth RPG bad-assery.

i have moon on my R4, kind of boring but its still a decent game

Also I would recommend Castlevania: Order of Ecclesia. Its levels are pretty linear the first time through and the challenge quotient is very high. It feels like the perfect synthesis of Castlevania gameplay so far.

Please don't talk about such things on here.

Advance wars is pretty good. :) Did not like castlevania at all..

Here's quite a big list of DS games I enjoyed or think they are good:

GTA: Chinatown Wars.

Professor Layton and the mysterious village.

WarioWare: Touched.

Advanced Wars: Dual Strike.

Advanced Wars: Days of Ruin.

Castlevania: Dawn of Sorrow.

Mario Kart DS.

New Super Mario Bros.

The Legend of Zelda: Phantom Hourglass.

Fire Emblem: Shadow Dragon.

Metroid Prime: Hunters.

Pokémon Diamond/Pearl/Platinum.

Moon.

Dragon Quest 4 and 5.

Final Fantasy 3,4.

Blue Dragon +.

Super Mario 64 DS.

Eehrm... I have to say, and yes this is serious, WarioWare is BY FAR the Best DS game there is! I swear to god! It's the god of all minigames! Total <3 for that game!!!!!!!!!!!

Those are/might be good. But really... wario ware. I can't stand it. :D

Well, DS was a disappointment. I thought it was supposed to have a good library of games. :/

Well perhaps you should think for yourself if it isn't you who has a bad taste, instead of a bad library.

Umm, no. My taste is excellent, I like the best games! ;)